Farming a drying Europe

Technique library

18 techniques documented — every practice we found real European evidence for. What is still thin is cost and funding data outside a handful of countries.

• Agroforestry & Windbreaks

  Trees among crops or pasture cut windspeed and evapotranspiration, so the crop needs less water rather than being given more. The only technique here that reduces demand.

  Good Long Medium

• Biochar

  Charred biomass worked into the soil. Its carbon is permanent and certified, its water benefit is real on sand and small on clay, and its yield effect in temperate Europe is about zero. At the rates trials use it is the most expensive technique on this site by a wide margin.

  Mixed Moderate High

• Compost

  Adding stabilised organic matter to the soil. Good long-term European evidence for structure, infiltration and yield stability; the water-storage figure everyone quotes is wrong by an order of magnitude; and compost tea is a different, weakly evidenced product.

  Good Reversible Low

• Cover Crops & Green Manure

  Growing a crop to feed the soil rather than to sell. Works well above roughly 700 mm of annual rainfall, can cost you yield below it, and frequently loses money even where it works.

  Mixed Reversible Medium

• Crop Residue Management

  Deciding what happens to the straw and stover after harvest. The only soil practice here with a direct cash cost, because straw is a saleable product.

  Good Reversible Free or near-free

• Drought-tolerant varieties

  Choosing what to sow. Four different things are sold as "drought tolerant", and they range from a real but modest edge in modern cultivars to a market decision dressed as agronomy. This is the first technique on this site whose case is strongest in the Mediterranean.

  Mixed Reversible Low

• Hydrogels and superabsorbent polymers

  Cross-linked polymers that swell with water and release it slowly. The decisive fact is not agronomic: a conventional synthetic polymer is a restricted microplastic in the EU with a compliance deadline in 2028. Behind that sit three European field trials and one unanswered question about whether roots can reach the water at all.

  Weak Moderate Medium

• Intercropping

  Growing two grain crops in one field, usually a cereal and a legume. More grain per hectare at low input is well evidenced; drought insurance is not, and the hard part is what happens to the mixed grain at harvest.

  Mixed Reversible Low

• Ley–arable rotation and pasture cropping

  Putting grass and livestock back into the arable rotation. The European form, years of ley alternated with crops, has 85 years of English soil data behind it. The Australian import, a cereal drilled into a dormant pasture, lost half its grain in the one European trial's dry year. And before either, check whether the field is permanent grassland.

  Mixed Moderate Low

• Mulching

  Covering bare soil cuts evaporation, stops runoff and slowly builds water-holding capacity. The cheapest version uses residue you already own.

  Strong Reversible Free or near-free

• Mycorrhizal inoculation

  Adding bought mycorrhizal fungi to a soil that already has them. One field in four responds, a soil pathogen test rather than a fertility test predicts which, the drought claim rests on greenhouse work, and four in five products tested contained no live fungus. Cheap per hectare, and the free version is on other pages of this site.

  Weak Reversible Low

• No-Till & Reduced Tillage

  Establishing crops with minimal soil disturbance. Costs yield on its own, but eliminates the penalty and raises productivity in dry climates when combined with residue retention and rotation.

  Good Moderate Medium

• Ollas & Subsurface Drip Irrigation

  Delivering water below the soil surface, where it cannot evaporate. Strong evidence that it helps your farm, and equally strong evidence that it does not help your region.

  Good Moderate High

• Precision irrigation

  Deciding when and how much to irrigate, rather than what pipe to use. The free regional services are the best-evidenced part, deficit irrigation on olive is the best-measured, sensor savings swing wildly between seasons, and nobody in Europe has published what a farm sensor system costs.

  Mixed Reversible Low

• Rotational and planned grazing

  Splitting pasture into paddocks and resting each one. Well evidenced for output on improved temperate grass, unproven on dry rangeland at the same stocking rate, and the branded versions have not been shown to beat ordinary rotation. The drought tool is the plan and the forage bank, not the paddock count.

  Mixed Reversible Medium

• Satellite drought monitoring

  Using satellite imagery to see drought and crop stress. The free European products are good at regional scale and cannot see your field. The paid ones resell that same free imagery, and no European trial shows one changing a farm decision for the better. The satellite that matters most is the one your paying agency already points at your parcels.

  Weak Reversible Low

• Swales, Keyline & Contour Earthworks

  Contour earthworks that slow and infiltrate runoff. Far more popular than the evidence supports, permanent once dug, and the only technique here that can fail dangerously.

  Weak Permanent High

• Water Retention Landscapes & Farm Ponds

  Storing runoff on the farm, from rainwater capture to dispersed check dams to open ponds. What is well measured here is how much water you lose, not how much you gain.

  Mixed Permanent High

No technique matches all of those filters. Try widening one — several practices are only defensible in particular climates.